usr.bin/gzip/gzip.c

   1 /*      $NetBSD: gzip.c,v 1.67 2004/09/11 11:07:44 dsl Exp $    */
   2 /*      $DragonFly: src/usr.bin/gzip/gzip.c,v 1.1 2004/10/26 11:19:31 joerg Exp $ */
   3
   4 /*
   5  * Copyright (c) 1997, 1998, 2003, 2004 Matthew R. Green
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * gzip.c -- GPL free gzip using zlib.
  34  *
  35  * RFC 1950 covers the zlib format
  36  * RFC 1951 covers the deflate format
  37  * RFC 1952 covers the gzip format
  38  *
  39  * TODO:
  40  *      - use mmap where possible
  41  *      - handle some signals better (remove outfile?)
  42  *      - make bzip2/compress -v/-t/-l support work as well as possible
  43  */
  44
  45 #include <sys/param.h>
  46 #include <sys/stat.h>
  47 #include <sys/time.h>
  48
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <fts.h>
  53 #include <getopt.h>
  54 #include <inttypes.h>
  55 #include <libgen.h>
  56 #include <stdarg.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <unistd.h>
  61 #include <zlib.h>
  62
  63 #ifndef PRIdOFF
  64 #define PRIdOFF PRId64
  65 #endif
  66
  67 /* what type of file are we dealing with */
  68 enum filetype {
  69         FT_GZIP,
  70 #ifndef NO_BZIP2_SUPPORT
  71         FT_BZIP2,
  72 #endif
  73 #ifndef NO_COMPRESS_SUPPORT
  74         FT_Z,
  75 #endif
  76         FT_LAST,
  77         FT_UNKNOWN
  78 };
  79
  80 #ifndef NO_BZIP2_SUPPORT
  81 #include <bzlib.h>
  82
  83 #define BZ2_SUFFIX      ".bz2"
  84 #define BZIP2_MAGIC     "\102\132\150"
  85 #endif
  86
  87 #ifndef NO_COMPRESS_SUPPORT
  88 #define Z_SUFFIX        ".Z"
  89 #define Z_MAGIC         "\037\235"
  90 #endif
  91
  92 #define GZ_SUFFIX       ".gz"
  93
  94 #define BUFLEN          (64 * 1024)
  95
  96 #define GZIP_MAGIC0     0x1F
  97 #define GZIP_MAGIC1     0x8B
  98 #define GZIP_OMAGIC1    0x9E
  99
 100 #define GZIP_TIMESTAMP  (off_t)4
 101 #define GZIP_ORIGNAME   (off_t)10
 102
 103 #define HEAD_CRC        0x02
 104 #define EXTRA_FIELD     0x04
 105 #define ORIG_NAME       0x08
 106 #define COMMENT         0x10
 107
 108 #define OS_CODE         3       /* Unix */
 109
 110 typedef struct {
 111     const char  *zipped;
 112     int         ziplen;
 113     const char  *normal;        /* for unzip - must not be longer than zipped */
 114 } suffixes_t;
 115 static suffixes_t suffixes[] = {
 116 #define SUFFIX(Z, N) {Z, sizeof Z - 1, N}
 117         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S .xxx */
 118 #ifndef SMALL
 119         SUFFIX(GZ_SUFFIX,       ""),
 120         SUFFIX(".z",            ""),
 121         SUFFIX("-gz",           ""),
 122         SUFFIX("-z",            ""),
 123         SUFFIX("_z",            ""),
 124         SUFFIX(".taz",          ".tar"),
 125         SUFFIX(".tgz",          ".tar"),
 126 #ifndef NO_BZIP2_SUPPORT
 127         SUFFIX(BZ2_SUFFIX,      ""),
 128 #endif
 129 #ifndef NO_COMPRESS_SUPPORT
 130         SUFFIX(Z_SUFFIX,        ""),
 131 #endif
 132         SUFFIX(GZ_SUFFIX,       ""),    /* Overwritten by -S "" */
 133 #endif /* SMALL */
 134 #undef SUFFIX
 135 };
 136 #define NUM_SUFFIXES (sizeof suffixes / sizeof suffixes[0])
 137
 138 static  const char      gzip_version[] = "NetBSD gzip 20040830";
 139
 140 static  int     cflag;                  /* stdout mode */
 141 static  int     dflag;                  /* decompress mode */
 142 static  int     lflag;                  /* list mode */
 143 static  int     numflag = 6;            /* gzip -1..-9 value */
 144
 145 #ifndef SMALL
 146 static  int     fflag;                  /* force mode */
 147 static  int     nflag;                  /* don't save name/timestamp */
 148 static  int     Nflag;                  /* don't restore name/timestamp */
 149 static  int     qflag;                  /* quiet mode */
 150 static  int     rflag;                  /* recursive mode */
 151 static  int     tflag;                  /* test */
 152 static  int     vflag;                  /* verbose mode */
 153 #else
 154 #define         qflag   0
 155 #define         tflag   0
 156 #endif
 157
 158 static  int     exit_value = 0;         /* exit value */
 159
 160 static  char    *infile;                /* name of file coming in */
 161
 162 static  void    maybe_err(const char *fmt, ...)
 163     __attribute__((__format__(__printf__, 1, 2)));
 164 #ifndef NO_BZIP2_SUPPORT
 165 static  void    maybe_errx(const char *fmt, ...)
 166     __attribute__((__format__(__printf__, 1, 2)));
 167 #endif
 168 static  void    maybe_warn(const char *fmt, ...)
 169     __attribute__((__format__(__printf__, 1, 2)));
 170 static  void    maybe_warnx(const char *fmt, ...)
 171     __attribute__((__format__(__printf__, 1, 2)));
 172 static  enum filetype file_gettype(u_char *);
 173 #ifdef SMALL
 174 #define gz_compress(if, of, sz, fn, tm) gz_compress(if, of, sz)
 175 #endif
 176 static  off_t   gz_compress(int, int, off_t *, const char *, uint32_t);
 177 static  off_t   gz_uncompress(int, int, char *, size_t, off_t *, const char *);
 178 static  off_t   file_compress(char *, char *, size_t);
 179 static  off_t   file_uncompress(char *, char *, size_t);
 180 static  void    handle_pathname(char *);
 181 static  void    handle_file(char *, struct stat *);
 182 static  void    handle_stdin(void);
 183 static  void    handle_stdout(void);
 184 static  void    print_ratio(off_t, off_t, FILE *);
 185 static  void    print_list(int fd, off_t, const char *, time_t);
 186 static  void    usage(void);
 187 static  void    display_version(void);
 188 static  const suffixes_t *check_suffix(char *, int);
 189
 190 #ifdef SMALL
 191 #define unlink_input(f, sb) unlink(f)
 192 #else
 193 static  off_t   cat_fd(unsigned char *, ssize_t, off_t *, int fd);
 194 static  void    prepend_gzip(char *, int *, char ***);
 195 static  void    handle_dir(char *);
 196 static  void    print_verbage(const char *, const char *, off_t, off_t);
 197 static  void    print_test(const char *, int);
 198 static  void    copymodes(const char *, struct stat *);
 199 static  int     check_outfile(const char *outfile, struct stat *sb);
 200 #endif
 201
 202 #ifndef NO_BZIP2_SUPPORT
 203 static  off_t   unbzip2(int, int, char *, size_t, off_t *);
 204 #endif
 205
 206 #ifndef NO_COMPRESS_SUPPORT
 207 static  FILE    *zdopen(int);
 208 static  off_t   zuncompress(FILE *, FILE *, char *, size_t, off_t *);
 209 #endif
 210
 211 int main(int, char *p[]);
 212
 213 #ifdef SMALL
 214 #define getopt_long(a,b,c,d,e) getopt(a,b,c)
 215 #else
 216 static const struct option longopts[] = {
 217         { "stdout",             no_argument,            0,      'c' },
 218         { "to-stdout",          no_argument,            0,      'c' },
 219         { "decompress",         no_argument,            0,      'd' },
 220         { "uncompress",         no_argument,            0,      'd' },
 221         { "force",              no_argument,            0,      'f' },
 222         { "help",               no_argument,            0,      'h' },
 223         { "list",               no_argument,            0,      'l' },
 224         { "no-name",            no_argument,            0,      'n' },
 225         { "name",               no_argument,            0,      'N' },
 226         { "quiet",              no_argument,            0,      'q' },
 227         { "recursive",          no_argument,            0,      'r' },
 228         { "suffix",             required_argument,      0,      'S' },
 229         { "test",               no_argument,            0,      't' },
 230         { "verbose",            no_argument,            0,      'v' },
 231         { "version",            no_argument,            0,      'V' },
 232         { "fast",               no_argument,            0,      '1' },
 233         { "best",               no_argument,            0,      '9' },
 234 #if 0
 235         /*
 236          * This is what else GNU gzip implements.  --ascii isn't useful
 237          * on NetBSD, and I don't care to have a --license.
 238          */
 239         { "ascii",              no_argument,            0,      'a' },
 240         { "license",            no_argument,            0,      'L' },
 241 #endif
 242         { NULL,                 no_argument,            0,      0 },
 243 };
 244 #endif
 245
 246 int
 247 main(int argc, char **argv)
 248 {
 249         const char *progname = getprogname();
 250 #ifndef SMALL
 251         char *gzip;
 252         int len;
 253 #endif
 254         int ch;
 255
 256         /* XXX set up signals */
 257
 258 #ifndef SMALL
 259         if ((gzip = getenv("GZIP")) != NULL)
 260                 prepend_gzip(gzip, &argc, &argv);
 261 #endif
 262
 263         /*
 264          * XXX
 265          * handle being called `gunzip', `zcat' and `gzcat'
 266          */
 267         if (strcmp(progname, "gunzip") == 0)
 268                 dflag = 1;
 269         else if (strcmp(progname, "zcat") == 0 ||
 270                  strcmp(progname, "gzcat") == 0)
 271                 dflag = cflag = 1;
 272
 273 #ifdef SMALL
 274 #define OPT_LIST "cdhHltV123456789"
 275 #else
 276 #define OPT_LIST "cdfhHlnNqrS:tvV123456789"
 277 #endif
 278
 279         while ((ch = getopt_long(argc, argv, OPT_LIST, longopts, NULL)) != -1) {
 280                 switch (ch) {
 281                 case 'c':
 282                         cflag = 1;
 283                         break;
 284                 case 'd':
 285                         dflag = 1;
 286                         break;
 287                 case 'l':
 288                         lflag = 1;
 289                         dflag = 1;
 290                         break;
 291                 case 'V':
 292                         display_version();
 293                         /* NOTREACHED */
 294                 case '1': case '2': case '3':
 295                 case '4': case '5': case '6':
 296                 case '7': case '8': case '9':
 297                         numflag = ch - '0';
 298                         break;
 299 #ifndef SMALL
 300                 case 'f':
 301                         fflag = 1;
 302                         break;
 303                 case 'n':
 304                         nflag = 1;
 305                         Nflag = 0;
 306                         break;
 307                 case 'N':
 308                         nflag = 0;
 309                         Nflag = 1;
 310                         break;
 311                 case 'q':
 312                         qflag = 1;
 313                         break;
 314                 case 'r':
 315                         rflag = 1;
 316                         break;
 317                 case 'S':
 318                         len = strlen(optarg);
 319                         if (len != 0) {
 320                                 suffixes[0].zipped = optarg;
 321                                 suffixes[0].ziplen = len;
 322                         } else {
 323                                 suffixes[NUM_SUFFIXES - 1].zipped = "";
 324                                 suffixes[NUM_SUFFIXES - 1].ziplen = 0;
 325                         }
 326                         break;
 327                 case 't':
 328                         cflag = 1;
 329                         tflag = 1;
 330                         dflag = 1;
 331                         break;
 332                 case 'v':
 333                         vflag = 1;
 334                         break;
 335 #endif
 336                 default:
 337                         usage();
 338                         /* NOTREACHED */
 339                 }
 340         }
 341         argv += optind;
 342         argc -= optind;
 343
 344         if (argc == 0) {
 345                 if (dflag)      /* stdin mode */
 346                         handle_stdin();
 347                 else            /* stdout mode */
 348                         handle_stdout();
 349         } else {
 350                 do {
 351                         handle_pathname(argv[0]);
 352                 } while (*++argv);
 353         }
 354 #ifndef SMALL
 355         if (qflag == 0 && lflag && argc > 1)
 356                 print_list(-1, 0, "(totals)", 0);
 357 #endif
 358         exit(exit_value);
 359 }
 360
 361 /* maybe print a warning */
 362 void
 363 maybe_warn(const char *fmt, ...)
 364 {
 365         va_list ap;
 366
 367         if (qflag == 0) {
 368                 va_start(ap, fmt);
 369                 vwarn(fmt, ap);
 370                 va_end(ap);
 371         }
 372         if (exit_value == 0)
 373                 exit_value = 1;
 374 }
 375
 376 /* ... without an errno. */
 377 void
 378 maybe_warnx(const char *fmt, ...)
 379 {
 380         va_list ap;
 381
 382         if (qflag == 0) {
 383                 va_start(ap, fmt);
 384                 vwarnx(fmt, ap);
 385                 va_end(ap);
 386         }
 387         if (exit_value == 0)
 388                 exit_value = 1;
 389 }
 390
 391 /* maybe print an error */
 392 void
 393 maybe_err(const char *fmt, ...)
 394 {
 395         va_list ap;
 396
 397         if (qflag == 0) {
 398                 va_start(ap, fmt);
 399                 vwarn(fmt, ap);
 400                 va_end(ap);
 401         }
 402         exit(2);
 403 }
 404
 405 #ifndef NO_BZIP2_SUPPORT
 406 /* ... without an errno. */
 407 void
 408 maybe_errx(const char *fmt, ...)
 409 {
 410         va_list ap;
 411
 412         if (qflag == 0) {
 413                 va_start(ap, fmt);
 414                 vwarnx(fmt, ap);
 415                 va_end(ap);
 416         }
 417         exit(2);
 418 }
 419 #endif
 420
 421 #ifndef SMALL
 422 /* split up $GZIP and prepend it to the argument list */
 423 static void
 424 prepend_gzip(char *gzip, int *argc, char ***argv)
 425 {
 426         char *s, **nargv, **ac;
 427         int nenvarg = 0, i;
 428
 429         /* scan how many arguments there are */
 430         for (s = gzip; *s; s++) {
 431                 if (*s == ' ' || *s == '\t')
 432                         continue;
 433                 nenvarg++;
 434                 for (; *s; s++)
 435                         if (*s == ' ' || *s == '\t')
 436                                 break;
 437                 if (*s == 0x0)
 438                         break;
 439         }
 440         /* punt early */
 441         if (nenvarg == 0)
 442                 return;
 443
 444         *argc += nenvarg;
 445         ac = *argv;
 446
 447         nargv = (char **)malloc((*argc + 1) * sizeof(char *));
 448         if (nargv == NULL)
 449                 maybe_err("malloc");
 450
 451         /* stash this away */
 452         *argv = nargv;
 453
 454         /* copy the program name first */
 455         i = 0;
 456         nargv[i++] = *(ac++);
 457
 458         /* take a copy of $GZIP and add it to the array */
 459         s = strdup(gzip);
 460         if (s == NULL)
 461                 maybe_err("strdup");
 462         for (; *s; s++) {
 463                 if (*s == ' ' || *s == '\t')
 464                         continue;
 465                 nargv[i++] = s;
 466                 for (; *s; s++)
 467                         if (*s == ' ' || *s == '\t') {
 468                                 *s = 0;
 469                                 break;
 470                         }
 471         }
 472
 473         /* copy the original arguments and a NULL */
 474         while (*ac)
 475                 nargv[i++] = *(ac++);
 476         nargv[i] = NULL;
 477 }
 478 #endif
 479
 480 /* compress input to output. Return bytes read, -1 on error */
 481 static off_t
 482 gz_compress(int in, int out, off_t *gsizep, const char *origname, uint32_t mtime)
 483 {
 484         z_stream z;
 485         char *outbufp, *inbufp;
 486         off_t in_tot = 0, out_tot = 0;
 487         ssize_t in_size;
 488         int i, error;
 489         uLong crc;
 490 #ifdef SMALL
 491         static char header[] = { GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED, 0,
 492                                  0, 0, 0, 0,
 493                                  0, OS_CODE };
 494 #endif
 495
 496         outbufp = malloc(BUFLEN);
 497         inbufp = malloc(BUFLEN);
 498         if (outbufp == NULL || inbufp == NULL) {
 499                 maybe_err("malloc failed");
 500                 goto out;
 501         }
 502
 503         memset(&z, 0, sizeof z);
 504         z.zalloc = Z_NULL;
 505         z.zfree = Z_NULL;
 506         z.opaque = 0;
 507
 508 #ifdef SMALL
 509         memcpy(outbufp, header, sizeof header);
 510         i = sizeof header;
 511 #else
 512         if (nflag != 0) {
 513                 mtime = 0;
 514                 origname = "";
 515         }
 516
 517         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c%c%c%s",
 518                      GZIP_MAGIC0, GZIP_MAGIC1, Z_DEFLATED,
 519                      *origname ? ORIG_NAME : 0,
 520                      mtime & 0xff,
 521                      (mtime >> 8) & 0xff,
 522                      (mtime >> 16) & 0xff,
 523                      (mtime >> 24) & 0xff,
 524                      numflag == 1 ? 4 : numflag == 9 ? 2 : 0,
 525                      OS_CODE, origname);
 526         if (i >= BUFLEN)
 527                 /* this need PATH_MAX > BUFLEN ... */
 528                 maybe_err("snprintf");
 529         if (*origname)
 530                 i++;
 531 #endif
 532
 533         z.next_out = outbufp + i;
 534         z.avail_out = BUFLEN - i;
 535
 536         error = deflateInit2(&z, numflag, Z_DEFLATED,
 537                              -MAX_WBITS, 8, Z_DEFAULT_STRATEGY);
 538         if (error != Z_OK) {
 539                 maybe_warnx("deflateInit2 failed");
 540                 in_tot = -1;
 541                 goto out;
 542         }
 543
 544         crc = crc32(0L, Z_NULL, 0);
 545         for (;;) {
 546                 if (z.avail_out == 0) {
 547                         if (write(out, outbufp, BUFLEN) != BUFLEN) {
 548                                 maybe_warn("write");
 549                                 in_tot = -1;
 550                                 goto out;
 551                         }
 552
 553                         out_tot += BUFLEN;
 554                         z.next_out = outbufp;
 555                         z.avail_out = BUFLEN;
 556                 }
 557
 558                 if (z.avail_in == 0) {
 559                         in_size = read(in, inbufp, BUFLEN);
 560                         if (in_size < 0) {
 561                                 maybe_warn("read");
 562                                 in_tot = -1;
 563                                 goto out;
 564                         }
 565                         if (in_size == 0)
 566                                 break;
 567
 568                         crc = crc32(crc, (const Bytef *)inbufp, (unsigned)in_size);
 569                         in_tot += in_size;
 570                         z.next_in = inbufp;
 571                         z.avail_in = in_size;
 572                 }
 573
 574                 error = deflate(&z, Z_NO_FLUSH);
 575                 if (error != Z_OK && error != Z_STREAM_END) {
 576                         maybe_warnx("deflate failed");
 577                         in_tot = -1;
 578                         goto out;
 579                 }
 580         }
 581
 582         /* clean up */
 583         for (;;) {
 584                 ssize_t len;
 585
 586                 error = deflate(&z, Z_FINISH);
 587                 if (error != Z_OK && error != Z_STREAM_END) {
 588                         maybe_warnx("deflate failed");
 589                         in_tot = -1;
 590                         goto out;
 591                 }
 592
 593                 len = (char *)z.next_out - outbufp;
 594
 595                 if (write(out, outbufp, len) != len) {
 596                         maybe_warn("write");
 597                         out_tot = -1;
 598                         goto out;
 599                 }
 600                 out_tot += len;
 601                 z.next_out = outbufp;
 602                 z.avail_out = BUFLEN;
 603
 604                 if (error == Z_STREAM_END)
 605                         break;
 606         }
 607
 608         if (deflateEnd(&z) != Z_OK) {
 609                 maybe_warnx("deflateEnd failed");
 610                 in_tot = -1;
 611                 goto out;
 612         }
 613
 614         i = snprintf(outbufp, BUFLEN, "%c%c%c%c%c%c%c%c",
 615                  (int)crc & 0xff,
 616                  (int)(crc >> 8) & 0xff,
 617                  (int)(crc >> 16) & 0xff,
 618                  (int)(crc >> 24) & 0xff,
 619                  (int)in_tot & 0xff,
 620                  (int)(in_tot >> 8) & 0xff,
 621                  (int)(in_tot >> 16) & 0xff,
 622                  (int)(in_tot >> 24) & 0xff);
 623         if (i != 8)
 624                 maybe_err("snprintf");
 625         if (write(out, outbufp, i) != i) {
 626                 maybe_warn("write");
 627                 in_tot = -1;
 628         } else
 629                 out_tot += i;
 630
 631 out:
 632         if (inbufp != NULL)
 633                 free(inbufp);
 634         if (outbufp != NULL)
 635                 free(outbufp);
 636         if (gsizep)
 637                 *gsizep = out_tot;
 638         return in_tot;
 639 }
 640
 641 /*
 642  * uncompress input to output then close the input.  return the
 643  * uncompressed size written, and put the compressed sized read
 644  * into `*gsizep'.
 645  */
 646 static off_t
 647 gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
 648               const char *filename)
 649 {
 650         z_stream z;
 651         char *outbufp, *inbufp;
 652         off_t out_tot = prelen, in_tot = 0;
 653         uint32_t out_sub_tot = 0;
 654         enum {
 655                 GZSTATE_MAGIC0,
 656                 GZSTATE_MAGIC1,
 657                 GZSTATE_METHOD,
 658                 GZSTATE_FLAGS,
 659                 GZSTATE_SKIPPING,
 660                 GZSTATE_EXTRA,
 661                 GZSTATE_EXTRA2,
 662                 GZSTATE_EXTRA3,
 663                 GZSTATE_ORIGNAME,
 664                 GZSTATE_COMMENT,
 665                 GZSTATE_HEAD_CRC1,
 666                 GZSTATE_HEAD_CRC2,
 667                 GZSTATE_INIT,
 668                 GZSTATE_READ,
 669                 GZSTATE_CRC,
 670                 GZSTATE_LEN,
 671         } state = GZSTATE_MAGIC0;
 672         int flags = 0, skip_count = 0;
 673         int error = 0, done_reading = 0;
 674         uLong crc = 0;
 675         ssize_t wr;
 676
 677 #define ADVANCE()       { z.next_in++; z.avail_in--; }
 678
 679         if ((outbufp = malloc(BUFLEN)) == NULL) {
 680                 maybe_err("malloc failed");
 681                 goto out2;
 682         }
 683         if ((inbufp = malloc(BUFLEN)) == NULL) {
 684                 maybe_err("malloc failed");
 685                 goto out1;
 686         }
 687
 688         memset(&z, 0, sizeof z);
 689         z.avail_in = prelen;
 690         z.next_in = pre;
 691         z.avail_out = BUFLEN;
 692         z.next_out = outbufp;
 693         z.zalloc = NULL;
 694         z.zfree = NULL;
 695         z.opaque = 0;
 696
 697
 698         for (;;) {
 699                 if (z.avail_in == 0 && done_reading == 0) {
 700                         ssize_t in_size = read(in, inbufp, BUFLEN);
 701
 702                         if (in_size == -1) {
 703 #ifndef SMALL
 704                                 if (tflag && vflag)
 705                                         print_test(filename, 0);
 706 #endif
 707                                 maybe_warn("failed to read stdin");
 708                                 out_tot = -1;
 709                                 goto stop;
 710                         } else if (in_size == 0)
 711                                 done_reading = 1;
 712
 713                         z.avail_in = in_size;
 714                         z.next_in = inbufp;
 715
 716                         in_tot += in_size;
 717                 }
 718                 if (z.avail_in == 0) {
 719                         if (done_reading && state != GZSTATE_MAGIC0)
 720                                 maybe_warnx("%s: unexpected end of file",
 721                                             filename);
 722                         goto stop;
 723                 }
 724                 switch (state) {
 725                 case GZSTATE_MAGIC0:
 726                         if (*z.next_in != GZIP_MAGIC0) {
 727                                 maybe_warnx("input not gziped (MAGIC0)");
 728                                 out_tot = -1;
 729                                 goto stop;
 730                         }
 731                         ADVANCE();
 732                         state++;
 733                         out_sub_tot = 0;
 734                         crc = crc32(0L, Z_NULL, 0);
 735                         break;
 736
 737                 case GZSTATE_MAGIC1:
 738                         if (*z.next_in != GZIP_MAGIC1 &&
 739                             *z.next_in != GZIP_OMAGIC1) {
 740                                 maybe_warnx("input not gziped (MAGIC1)");
 741                                 out_tot = -1;
 742                                 goto stop;
 743                         }
 744                         ADVANCE();
 745                         state++;
 746                         break;
 747
 748                 case GZSTATE_METHOD:
 749                         if (*z.next_in != Z_DEFLATED) {
 750                                 maybe_warnx("unknown compression method");
 751                                 out_tot = -1;
 752                                 goto stop;
 753                         }
 754                         ADVANCE();
 755                         state++;
 756                         break;
 757
 758                 case GZSTATE_FLAGS:
 759                         flags = *z.next_in;
 760                         ADVANCE();
 761                         skip_count = 6;
 762                         state++;
 763                         break;
 764
 765                 case GZSTATE_SKIPPING:
 766                         if (skip_count > 0) {
 767                                 skip_count--;
 768                                 ADVANCE();
 769                         } else
 770                                 state++;
 771                         break;
 772
 773                 case GZSTATE_EXTRA:
 774                         if ((flags & EXTRA_FIELD) == 0) {
 775                                 state = GZSTATE_ORIGNAME;
 776                                 break;
 777                         }
 778                         skip_count = *z.next_in;
 779                         ADVANCE();
 780                         state++;
 781                         break;
 782
 783                 case GZSTATE_EXTRA2:
 784                         skip_count |= ((*z.next_in) << 8);
 785                         ADVANCE();
 786                         state++;
 787                         break;
 788
 789                 case GZSTATE_EXTRA3:
 790                         if (skip_count > 0) {
 791                                 skip_count--;
 792                                 ADVANCE();
 793                         } else
 794                                 state++;
 795                         break;
 796
 797                 case GZSTATE_ORIGNAME:
 798                         if ((flags & ORIG_NAME) == 0) {
 799                                 state++;
 800                                 break;
 801                         }
 802                         if (*z.next_in == 0)
 803                                 state++;
 804                         ADVANCE();
 805                         break;
 806
 807                 case GZSTATE_COMMENT:
 808                         if ((flags & COMMENT) == 0) {
 809                                 state++;
 810                                 break;
 811                         }
 812                         if (*z.next_in == 0)
 813                                 state++;
 814                         ADVANCE();
 815                         break;
 816
 817                 case GZSTATE_HEAD_CRC1:
 818                         if (flags & HEAD_CRC)
 819                                 skip_count = 2;
 820                         else
 821                                 skip_count = 0;
 822                         state++;
 823                         break;
 824
 825                 case GZSTATE_HEAD_CRC2:
 826                         if (skip_count > 0) {
 827                                 skip_count--;
 828                                 ADVANCE();
 829                         } else
 830                                 state++;
 831                         break;
 832
 833                 case GZSTATE_INIT:
 834                         if (inflateInit2(&z, -MAX_WBITS) != Z_OK) {
 835                                 maybe_warnx("failed to inflateInit");
 836                                 out_tot = -1;
 837                                 goto stop;
 838                         }
 839                         state++;
 840                         break;
 841
 842                 case GZSTATE_READ:
 843                         error = inflate(&z, Z_FINISH);
 844                         /* Z_BUF_ERROR goes with Z_FINISH... */
 845                         if (error != Z_STREAM_END && error != Z_BUF_ERROR)
 846                                 /* Just need more input */
 847                                 break;
 848                         wr = BUFLEN - z.avail_out;
 849
 850                         if (wr != 0) {
 851                                 crc = crc32(crc, (const Bytef *)outbufp, (unsigned)wr);
 852                                 if (
 853 #ifndef SMALL
 854                                     /* don't write anything with -t */
 855                                     tflag == 0 &&
 856 #endif
 857                                     write(out, outbufp, wr) != wr) {
 858                                         maybe_warn("error writing to output");
 859                                         out_tot = -1;
 860                                         goto stop;
 861                                 }
 862
 863                                 out_tot += wr;
 864                                 out_sub_tot += wr;
 865                         }
 866
 867                         if (error == Z_STREAM_END) {
 868                                 inflateEnd(&z);
 869                                 state++;
 870                         }
 871
 872                         z.next_out = outbufp;
 873                         z.avail_out = BUFLEN;
 874
 875                         break;
 876                 case GZSTATE_CRC:
 877                         {
 878                                 static int empty_buffer = 0;
 879                                 uLong origcrc;
 880
 881                                 if (z.avail_in < 4) {
 882                                         if (!done_reading && empty_buffer++ < 4)
 883                                                 continue;
 884                                         maybe_warnx("truncated input");
 885                                         out_tot = -1;
 886                                         goto stop;
 887                                 }
 888                                 empty_buffer = 0;
 889                                 origcrc = ((unsigned)z.next_in[0] & 0xff) |
 890                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
 891                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
 892                                         ((unsigned)z.next_in[3] & 0xff) << 24;
 893                                 if (origcrc != crc) {
 894                                         maybe_warnx("invalid compressed"
 895                                              " data--crc error");
 896                                         out_tot = -1;
 897                                         goto stop;
 898                                 }
 899                         }
 900
 901                         z.avail_in -= 4;
 902                         z.next_in += 4;
 903
 904                         if (!z.avail_in)
 905                                 goto stop;
 906                         state++;
 907                         break;
 908                 case GZSTATE_LEN:
 909                         {
 910                                 static int empty_buffer = 0;
 911                                 uLong origlen;
 912
 913                                 if (z.avail_in < 4) {
 914                                         if (!done_reading && empty_buffer++ < 4)
 915                                                 continue;
 916                                         maybe_warnx("truncated input");
 917                                         out_tot = -1;
 918                                         goto stop;
 919                                 }
 920                                 empty_buffer = 0;
 921                                 origlen = ((unsigned)z.next_in[0] & 0xff) |
 922                                         ((unsigned)z.next_in[1] & 0xff) << 8 |
 923                                         ((unsigned)z.next_in[2] & 0xff) << 16 |
 924                                         ((unsigned)z.next_in[3] & 0xff) << 24;
 925
 926                                 if (origlen != out_sub_tot) {
 927                                         maybe_warnx("invalid compressed"
 928                                              " data--length error");
 929                                         out_tot = -1;
 930                                         goto stop;
 931                                 }
 932                         }
 933
 934                         z.avail_in -= 4;
 935                         z.next_in += 4;
 936
 937                         if (error < 0) {
 938                                 maybe_warnx("decompression error");
 939                                 out_tot = -1;
 940                                 goto stop;
 941                         }
 942                         state = GZSTATE_MAGIC0;
 943                         break;
 944                 }
 945                 continue;
 946 stop:
 947                 break;
 948         }
 949         if (state > GZSTATE_INIT)
 950                 inflateEnd(&z);
 951
 952 #ifndef SMALL
 953         if (tflag && vflag)
 954                 print_test(filename, out_tot != -1);
 955 #endif
 956
 957         free(inbufp);
 958 out1:
 959         free(outbufp);
 960 out2:
 961         if (gsizep)
 962                 *gsizep = in_tot;
 963         return (out_tot);
 964 }
 965
 966 #ifndef SMALL
 967 /*
 968  * set the owner, mode, flags & utimes for a file
 969  */
 970 static void
 971 copymodes(const char *file, struct stat *sbp)
 972 {
 973         struct timeval times[2];
 974
 975         /*
 976          * If we have no info on the input, give this file some
 977          * default values and return..
 978          */
 979         if (sbp == NULL) {
 980                 mode_t mask = umask(022);
 981
 982                 (void)chmod(file, DEFFILEMODE & ~mask);
 983                 (void)umask(mask);
 984                 return;
 985         }
 986
 987         /* if the chown fails, remove set-id bits as-per compress(1) */
 988         if (chown(file, sbp->st_uid, sbp->st_gid) < 0) {
 989                 if (errno != EPERM)
 990                         maybe_warn("couldn't chown: %s", file);
 991                 sbp->st_mode &= ~(S_ISUID|S_ISGID);
 992         }
 993
 994         /* we only allow set-id and the 9 normal permission bits */
 995         sbp->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
 996         if (chmod(file, sbp->st_mode) < 0)
 997                 maybe_warn("couldn't chmod: %s", file);
 998
 999         /* only try flags if they exist already */
1000         if (sbp->st_flags != 0 && chflags(file, sbp->st_flags) < 0)
1001                 maybe_warn("couldn't chflags: %s", file);
1002
1003         TIMESPEC_TO_TIMEVAL(&times[0], &sbp->st_atimespec);
1004         TIMESPEC_TO_TIMEVAL(&times[1], &sbp->st_mtimespec);
1005         if (utimes(file, times) < 0)
1006                 maybe_warn("couldn't utimes: %s", file);
1007 }
1008 #endif
1009
1010 /* what sort of file is this? */
1011 static enum filetype
1012 file_gettype(u_char *buf)
1013 {
1014
1015         if (buf[0] == GZIP_MAGIC0 &&
1016             (buf[1] == GZIP_MAGIC1 || buf[1] == GZIP_OMAGIC1))
1017                 return FT_GZIP;
1018         else
1019 #ifndef NO_BZIP2_SUPPORT
1020         if (memcmp(buf, BZIP2_MAGIC, 3) == 0 &&
1021             buf[3] >= '0' && buf[3] <= '9')
1022                 return FT_BZIP2;
1023         else
1024 #endif
1025 #ifndef NO_COMPRESS_SUPPORT
1026         if (memcmp(buf, Z_MAGIC, 2) == 0)
1027                 return FT_Z;
1028         else
1029 #endif
1030                 return FT_UNKNOWN;
1031 }
1032
1033 #ifndef SMALL
1034 /* check the outfile is OK. */
1035 static int
1036 check_outfile(const char *outfile, struct stat *sb)
1037 {
1038         int ok = 1;
1039
1040         if (lflag == 0 && stat(outfile, sb) == 0) {
1041                 if (fflag)
1042                         unlink(outfile);
1043                 else if (isatty(STDIN_FILENO)) {
1044                         char ans[10] = { 'n', '\0' };   /* default */
1045
1046                         fprintf(stderr, "%s already exists -- do you wish to "
1047                                         "overwrite (y or n)? " , outfile);
1048                         (void)fgets(ans, sizeof(ans) - 1, stdin);
1049                         if (ans[0] != 'y' && ans[0] != 'Y') {
1050                                 fprintf(stderr, "\tnot overwritting\n");
1051                                 ok = 0;
1052                         } else
1053                                 unlink(outfile);
1054                 } else {
1055                         maybe_warnx("%s already exists -- skipping", outfile);
1056                         ok = 0;
1057                 }
1058         }
1059         return ok;
1060 }
1061
1062 static void
1063 unlink_input(const char *file, struct stat *sb)
1064 {
1065         struct stat nsb;
1066
1067         if (stat(file, &nsb) != 0)
1068                 /* Must be gone alrady */
1069                 return;
1070         if (nsb.st_dev != sb->st_dev || nsb.st_ino != sb->st_ino)
1071                 /* Definitely a different file */
1072                 return;
1073         unlink(file);
1074 }
1075 #endif
1076
1077 static const suffixes_t *
1078 check_suffix(char *file, int xlate)
1079 {
1080         const suffixes_t *s;
1081         int len = strlen(file);
1082         char *sp;
1083
1084         for (s = suffixes; s != suffixes + NUM_SUFFIXES; s++) {
1085                 /* if it doesn't fit in "a.suf", don't bother */
1086                 if (s->ziplen >= len)
1087                         continue;
1088                 sp = file + len - s->ziplen;
1089                 if (strcmp(s->zipped, sp) != 0)
1090                         continue;
1091                 if (xlate)
1092                         strcpy(sp, s->normal);
1093                 return s;
1094         }
1095         return NULL;
1096 }
1097
1098 /*
1099  * compress the given file: create a corresponding .gz file and remove the
1100  * original.
1101  */
1102 static off_t
1103 file_compress(char *file, char *outfile, size_t outsize)
1104 {
1105         int in;
1106         int out;
1107         off_t size, insize;
1108 #ifndef SMALL
1109         struct stat isb, osb;
1110         const suffixes_t *suff;
1111 #endif
1112
1113         in = open(file, O_RDONLY);
1114         if (in == -1) {
1115                 maybe_warn("can't open %s", file);
1116                 return -1;
1117         }
1118
1119         if (cflag == 0) {
1120 #ifndef SMALL
1121                 if (stat(file, &isb) == 0) {
1122                         if (isb.st_nlink > 1 && fflag == 0) {
1123                                 maybe_warnx("%s has %d other link%s -- "
1124                                             "skipping", file, isb.st_nlink - 1,
1125                                             isb.st_nlink == 1 ? "" : "s");
1126                                 close(in);
1127                                 return -1;
1128                         }
1129                 }
1130
1131                 if (fflag == 0 && (suff = check_suffix(file, 0))
1132                     && suff->zipped[0] != 0) {
1133                         maybe_warnx("%s already has %s suffix -- unchanged",
1134                                     file, suff->zipped);
1135                         close(in);
1136                         return -1;
1137                 }
1138 #endif
1139
1140                 /* Add (usually) .gz to filename */
1141                 if ((size_t)snprintf(outfile, outsize, "%s%s",
1142                                         file, suffixes[0].zipped) >= outsize)
1143                         memcpy(outfile - suffixes[0].ziplen - 1,
1144                                 suffixes[0].zipped, suffixes[0].ziplen + 1);
1145
1146 #ifndef SMALL
1147                 if (check_outfile(outfile, &osb) == 0) {
1148                         close(in);
1149                         return -1;
1150                 }
1151 #endif
1152         }
1153
1154         if (cflag == 0) {
1155                 out = open(outfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
1156                 if (out == -1) {
1157                         maybe_warn("could not create output: %s", outfile);
1158                         fclose(stdin);
1159                         return -1;
1160                 }
1161         } else
1162                 out = STDOUT_FILENO;
1163
1164         insize = gz_compress(in, out, &size, basename(file), (uint32_t)isb.st_mtime);
1165
1166         (void)close(in);
1167
1168         /*
1169          * If there was an error, insize will be -1.
1170          * If we compressed to stdout, just return the size.
1171          * Otherwise stat the file and check it is the correct size.
1172          * We only blow away the file if we can stat the output and it
1173          * has the expected size.
1174          */
1175         if (cflag != 0)
1176                 return insize == -1 ? -1 : size;
1177
1178         if (close(out) == -1)
1179                 maybe_warn("couldn't close ouput");
1180
1181 #ifndef SMALL
1182         if (stat(outfile, &osb) < 0) {
1183                 maybe_warn("couldn't stat: %s", outfile);
1184                 goto bad_outfile;
1185         }
1186
1187         if (osb.st_size != size) {
1188                 maybe_warnx("output file: %s wrong size (%" PRIdOFF
1189                                 " != %" PRIdOFF "), deleting",
1190                                 outfile, osb.st_size, size);
1191                 goto bad_outfile;
1192         }
1193
1194         copymodes(outfile, &isb);
1195 #endif
1196
1197         /* output is good, ok to delete input */
1198         unlink_input(file, &isb);
1199         return size;
1200
1201 #ifndef SMALL
1202     bad_outfile:
1203         maybe_warnx("leaving original %s", file);
1204         unlink(outfile);
1205         return size;
1206 #endif
1207 }
1208
1209 /* uncompress the given file and remove the original */
1210 static off_t
1211 file_uncompress(char *file, char *outfile, size_t outsize)
1212 {
1213         struct stat isb, osb;
1214         off_t size;
1215         ssize_t rbytes;
1216         unsigned char header1[4];
1217         enum filetype method;
1218         int fd, zfd = -1;
1219 #ifndef SMALL
1220         time_t timestamp = 0;
1221         unsigned char name[PATH_MAX + 1];
1222 #endif
1223
1224         /* gather the old name info */
1225
1226         fd = open(file, O_RDONLY);
1227         if (fd < 0) {
1228                 maybe_warn("can't open %s", file);
1229                 goto lose;
1230         }
1231
1232         strlcpy(outfile, file, outsize);
1233         if (check_suffix(outfile, 1) == NULL && !(cflag || lflag)) {
1234                 maybe_warnx("%s: unknown suffix -- ignored", file);
1235                 goto lose;
1236         }
1237
1238         rbytes = read(fd, header1, sizeof header1);
1239         if (rbytes != sizeof header1) {
1240                 /* we don't want to fail here. */
1241 #ifndef SMALL
1242                 if (fflag)
1243                         goto lose;
1244 #endif
1245                 if (rbytes == -1)
1246                         maybe_warn("can't read %s", file);
1247                 else
1248                         maybe_warnx("%s: unexpected end of file", file);
1249                 goto lose;
1250         }
1251
1252         method = file_gettype(header1);
1253
1254 #ifndef SMALL
1255         if (fflag == 0 && method == FT_UNKNOWN) {
1256                 maybe_warnx("%s: not in gzip format", file);
1257                 goto lose;
1258         }
1259
1260 #endif
1261
1262 #ifndef SMALL
1263         if (method == FT_GZIP && Nflag) {
1264                 unsigned char ts[4];    /* timestamp */
1265
1266                 if (pread(fd, ts, sizeof ts, GZIP_TIMESTAMP) != sizeof ts) {
1267                         if (!fflag)
1268                                 maybe_warn("can't read %s", file);
1269                         goto lose;
1270                 }
1271                 timestamp = ts[3] << 24 | ts[2] << 16 | ts[1] << 8 | ts[0];
1272
1273                 if (header1[3] & ORIG_NAME) {
1274                         rbytes = pread(fd, name, sizeof name, GZIP_ORIGNAME);
1275                         if (rbytes < 0) {
1276                                 maybe_warn("can't read %s", file);
1277                                 goto lose;
1278                         }
1279                         if (name[0] != 0) {
1280                                 /* preserve original directory name */
1281                                 char *dp = strrchr(file, '/');
1282                                 if (dp == NULL)
1283                                         dp = file;
1284                                 else
1285                                         dp++;
1286                                 snprintf(outfile, outsize, "%.*s%.*s",
1287                                                 (int) (dp - file),
1288                                                 file, (int) rbytes, name);
1289                         }
1290                 }
1291         }
1292 #endif
1293         lseek(fd, 0, SEEK_SET);
1294
1295         if (cflag == 0 || lflag) {
1296                 if (fstat(fd, &isb) != 0)
1297                         goto lose;
1298 #ifndef SMALL
1299                 if (isb.st_nlink > 1 && lflag == 0 && fflag == 0) {
1300                         maybe_warnx("%s has %d other links -- skipping",
1301                             file, isb.st_nlink - 1);
1302                         goto lose;
1303                 }
1304                 if (nflag == 0 && timestamp)
1305                         isb.st_mtime = timestamp;
1306                 if (check_outfile(outfile, &osb) == 0)
1307                         goto lose;
1308 #endif
1309         }
1310
1311         if (cflag == 0 && lflag == 0) {
1312                 zfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0600);
1313                 if (zfd == STDOUT_FILENO) {
1314                         /* We won't close STDOUT_FILENO later... */
1315                         zfd = dup(zfd);
1316                         close(STDOUT_FILENO);
1317                 }
1318                 if (zfd == -1) {
1319                         maybe_warn("can't open %s", outfile);
1320                         goto lose;
1321                 }
1322         } else
1323                 zfd = STDOUT_FILENO;
1324
1325 #ifndef NO_BZIP2_SUPPORT
1326         if (method == FT_BZIP2) {
1327
1328                 /* XXX */
1329                 if (lflag) {
1330                         maybe_warnx("no -l with bzip2 files");
1331                         goto lose;
1332                 }
1333
1334                 size = unbzip2(fd, zfd, NULL, 0, NULL);
1335         } else
1336 #endif
1337
1338 #ifndef NO_COMPRESS_SUPPORT
1339         if (method == FT_Z) {
1340                 FILE *in, *out;
1341
1342                 /* XXX */
1343                 if (lflag) {
1344                         maybe_warnx("no -l with Lempel-Ziv files");
1345                         goto lose;
1346                 }
1347
1348                 if ((in = zdopen(fd)) == NULL) {
1349                         maybe_warn("zdopen for read: %s", file);
1350                         goto lose;
1351                 }
1352
1353                 out = fdopen(dup(zfd), "w");
1354                 if (out == NULL) {
1355                         maybe_warn("fdopen for write: %s", outfile);
1356                         fclose(in);
1357                         goto lose;
1358                 }
1359
1360                 size = zuncompress(in, out, NULL, 0, NULL);
1361                 /* need to fclose() if ferror() is true... */
1362                 if (ferror(in) | fclose(in)) {
1363                         maybe_warn("failed infile fclose");
1364                         unlink(outfile);
1365                         (void)fclose(out);
1366                 }
1367                 if (fclose(out) != 0) {
1368                         maybe_warn("failed outfile fclose");
1369                         unlink(outfile);
1370                         goto lose;
1371                 }
1372         } else
1373 #endif
1374
1375 #ifndef SMALL
1376         if (method == FT_UNKNOWN) {
1377                 if (lflag) {
1378                         maybe_warnx("no -l for unknown filetypes");
1379                         goto lose;
1380                 }
1381                 size = cat_fd(NULL, 0, NULL, fd);
1382         } else
1383 #endif
1384         {
1385                 if (lflag) {
1386                         print_list(fd, isb.st_size, outfile, isb.st_mtime);
1387                         close(fd);
1388                         return -1;      /* XXX */
1389                 }
1390
1391                 size = gz_uncompress(fd, zfd, NULL, 0, NULL, file);
1392         }
1393
1394         if (close(fd) != 0)
1395                 maybe_warn("couldn't close input");
1396         if (zfd != STDOUT_FILENO && close(zfd) != 0)
1397                 maybe_warn("couldn't close output");
1398
1399         if (size == -1) {
1400                 if (cflag == 0)
1401                         unlink(outfile);
1402                 maybe_warnx("%s: uncompress failed", file);
1403                 return -1;
1404         }
1405
1406         /* if testing, or we uncompressed to stdout, this is all we need */
1407 #ifndef SMALL
1408         if (tflag)
1409                 return size;
1410 #endif
1411         /* if we are uncompressing to stdin, don't remove the file. */
1412         if (cflag)
1413                 return size;
1414
1415         /*
1416          * if we create a file...
1417          */
1418         /*
1419          * if we can't stat the file don't remove the file.
1420          */
1421         if (stat(outfile, &osb) < 0) {
1422                 maybe_warn("couldn't stat (leaving original): %s",
1423                            outfile);
1424                 return -1;
1425         }
1426         if (osb.st_size != size) {
1427                 maybe_warn("stat gave different size: %" PRIdOFF
1428                                 " != %" PRIdOFF " (leaving original)",
1429                                 size, osb.st_size);
1430                 unlink(outfile);
1431                 return -1;
1432         }
1433         unlink_input(file, &isb);
1434 #ifndef SMALL
1435         copymodes(outfile, &isb);
1436 #endif
1437         return size;
1438
1439     lose:
1440         if (fd != -1)
1441                 close(fd);
1442         if (zfd != -1 && zfd != STDOUT_FILENO)
1443                 close(fd);
1444         return -1;
1445 }
1446
1447 #ifndef SMALL
1448 static off_t
1449 cat_fd(unsigned char * prepend, ssize_t count, off_t *gsizep, int fd)
1450 {
1451         char buf[BUFLEN];
1452         ssize_t rv;
1453         off_t in_tot;
1454
1455         in_tot = count;
1456         if (write(STDOUT_FILENO, prepend, count) != count) {
1457                 maybe_warn("write to stdout");
1458                 return -1;
1459         }
1460         for (;;) {
1461                 rv = read(fd, buf, sizeof buf);
1462                 if (rv == 0)
1463                         break;
1464                 if (rv < 0) {
1465                         maybe_warn("read from fd %d", fd);
1466                         break;
1467                 }
1468
1469                 if (write(STDOUT_FILENO, buf, rv) != rv) {
1470                         maybe_warn("write to stdout");
1471                         break;
1472                 }
1473                 in_tot += rv;
1474         }
1475
1476         if (gsizep)
1477                 *gsizep = in_tot;
1478         return (in_tot);
1479 }
1480 #endif
1481
1482 static void
1483 handle_stdin(void)
1484 {
1485         unsigned char header1[4];
1486         off_t usize, gsize;
1487         enum filetype method;
1488 #ifndef NO_COMPRESS_SUPPORT
1489         FILE *in;
1490 #endif
1491
1492 #ifndef SMALL
1493         if (fflag == 0 && lflag == 0 && isatty(STDIN_FILENO)) {
1494                 maybe_warnx("standard input is a terminal -- ignoring");
1495                 return;
1496         }
1497 #endif
1498
1499         if (lflag) {
1500                 struct stat isb;
1501
1502                 /* XXX could read the whole file, etc. */
1503                 if (fstat(STDIN_FILENO, &isb) < 0) {
1504                         maybe_warn("fstat");
1505                         return;
1506                 }
1507                 print_list(STDIN_FILENO, isb.st_size, "stdout", isb.st_mtime);
1508                 return;
1509         }
1510
1511         if (read(STDIN_FILENO, header1, sizeof header1) != sizeof header1) {
1512                 maybe_warn("can't read stdin");
1513                 return;
1514         }
1515
1516         method = file_gettype(header1);
1517         switch (method) {
1518         default:
1519 #ifndef SMALL
1520                 if (fflag == 0) {
1521                         maybe_warnx("unknown compression format");
1522                         return;
1523                 }
1524                 usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
1525                 break;
1526 #endif
1527         case FT_GZIP:
1528                 usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
1529                               header1, sizeof header1, &gsize, "(stdin)");
1530                 break;
1531 #ifndef NO_BZIP2_SUPPORT
1532         case FT_BZIP2:
1533                 usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
1534                                 header1, sizeof header1, &gsize);
1535                 break;
1536 #endif
1537 #ifndef NO_COMPRESS_SUPPORT
1538         case FT_Z:
1539                 if ((in = zdopen(STDIN_FILENO)) == NULL) {
1540                         maybe_warnx("zopen of stdin");
1541                         return;
1542                 }
1543
1544                 usize = zuncompress(in, stdout, header1, sizeof header1, &gsize);
1545                 fclose(in);
1546                 break;
1547 #endif
1548         }
1549
1550 #ifndef SMALL
1551         if (vflag && !tflag && usize != -1 && gsize != -1)
1552                 print_verbage(NULL, NULL, usize, gsize);
1553 #endif
1554
1555 }
1556
1557 static void
1558 handle_stdout(void)
1559 {
1560         off_t gsize, usize;
1561
1562 #ifndef SMALL
1563         if (fflag == 0 && isatty(STDOUT_FILENO)) {
1564                 maybe_warnx("standard output is a terminal -- ignoring");
1565                 return;
1566         }
1567 #endif
1568         usize = gz_compress(STDIN_FILENO, STDOUT_FILENO, &gsize, "", 0);
1569
1570 #ifndef SMALL
1571         if (vflag && !tflag && usize != -1 && gsize != -1)
1572                 print_verbage(NULL, NULL, usize, gsize);
1573 #endif
1574 }
1575
1576 /* do what is asked for, for the path name */
1577 static void
1578 handle_pathname(char *path)
1579 {
1580         char *opath = path, *s = NULL;
1581         ssize_t len;
1582         int slen;
1583         struct stat sb;
1584
1585         /* check for stdout/stdin */
1586         if (path[0] == '-' && path[1] == '\0') {
1587                 if (dflag)
1588                         handle_stdin();
1589                 else
1590                         handle_stdout();
1591                 return;
1592         }
1593
1594 retry:
1595         if (stat(path, &sb) < 0) {
1596                 /* lets try <path>.gz if we're decompressing */
1597                 if (dflag && s == NULL && errno == ENOENT) {
1598                         len = strlen(path);
1599                         slen = suffixes[0].ziplen;
1600                         s = malloc(len + slen + 1);
1601                         if (s == NULL)
1602                                 maybe_err("malloc");
1603                         memcpy(s, path, len);
1604                         memcpy(s + len, suffixes[0].zipped, slen + 1);
1605                         path = s;
1606                         goto retry;
1607                 }
1608                 maybe_warn("can't stat: %s", opath);
1609                 goto out;
1610         }
1611
1612         if (S_ISDIR(sb.st_mode)) {
1613 #ifndef SMALL
1614                 if (rflag)
1615                         handle_dir(path);
1616                 else
1617 #endif
1618                         maybe_warnx("%s is a directory", path);
1619                 goto out;
1620         }
1621
1622         if (S_ISREG(sb.st_mode))
1623                 handle_file(path, &sb);
1624         else
1625                 maybe_warnx("%s is not a regular file", path);
1626
1627 out:
1628         if (s)
1629                 free(s);
1630 }
1631
1632 /* compress/decompress a file */
1633 static void
1634 handle_file(char *file, struct stat *sbp)
1635 {
1636         off_t usize, gsize;
1637         char    outfile[PATH_MAX];
1638
1639         infile = file;
1640         if (dflag) {
1641                 usize = file_uncompress(file, outfile, sizeof(outfile));
1642                 if (usize == -1)
1643                         return;
1644                 gsize = sbp->st_size;
1645         } else {
1646                 gsize = file_compress(file, outfile, sizeof(outfile));
1647                 if (gsize == -1)
1648                         return;
1649                 usize = sbp->st_size;
1650         }
1651
1652
1653 #ifndef SMALL
1654         if (vflag && !tflag)
1655                 print_verbage(file, (cflag) ? NULL : outfile, usize, gsize);
1656 #endif
1657 }
1658
1659 #ifndef SMALL
1660 /* this is used with -r to recursively descend directories */
1661 static void
1662 handle_dir(char *dir)
1663 {
1664         char *path_argv[2];
1665         FTS *fts;
1666         FTSENT *entry;
1667
1668         path_argv[0] = dir;
1669         path_argv[1] = 0;
1670         fts = fts_open(path_argv, FTS_PHYSICAL, NULL);
1671         if (fts == NULL) {
1672                 warn("couldn't fts_open %s", dir);
1673                 return;
1674         }
1675
1676         while ((entry = fts_read(fts))) {
1677                 switch(entry->fts_info) {
1678                 case FTS_D:
1679                 case FTS_DP:
1680                         continue;
1681
1682                 case FTS_DNR:
1683                 case FTS_ERR:
1684                 case FTS_NS:
1685                         maybe_warn("%s", entry->fts_path);
1686                         continue;
1687                 case FTS_F:
1688                         handle_file(entry->fts_name, entry->fts_statp);
1689                 }
1690         }
1691         (void)fts_close(fts);
1692 }
1693 #endif
1694
1695 /* print a ratio - size reduction as a fraction of uncompressed size */
1696 static void
1697 print_ratio(off_t in, off_t out, FILE *where)
1698 {
1699         int percent10;  /* 10 * percent */
1700         off_t diff;
1701         char buff[8];
1702         int len;
1703
1704         diff = in - out/2;
1705         if (diff <= 0)
1706                 /*
1707                  * Output is more than double size of input! print -99.9%
1708                  * Quite possibly we've failed to get the original size.
1709                  */
1710                 percent10 = -999;
1711         else {
1712                 /*
1713                  * We only need 12 bits of result from the final division,
1714                  * so reduce the values until a 32bit division will suffice.
1715                  */
1716                 while (in > 0x100000) {
1717                         diff >>= 1;
1718                         in >>= 1;
1719                 }
1720                 if (in != 0)
1721                         percent10 = ((u_int)diff * 2000) / (u_int)in - 1000;
1722                 else
1723                         percent10 = 0;
1724         }
1725
1726         len = snprintf(buff, sizeof buff, "%2.2d.", percent10);
1727         /* Move the '.' to before the last digit */
1728         buff[len - 1] = buff[len - 2];
1729         buff[len - 2] = '.';
1730         fprintf(where, "%5s%%", buff);
1731 }
1732
1733 #ifndef SMALL
1734 /* print compression statistics, and the new name (if there is one!) */
1735 static void
1736 print_verbage(const char *file, const char *nfile, off_t usize, off_t gsize)
1737 {
1738         if (file)
1739                 fprintf(stderr, "%s:%s  ", file,
1740                     strlen(file) < 7 ? "\t\t" : "\t");
1741         print_ratio(usize, gsize, stderr);
1742         if (nfile)
1743                 fprintf(stderr, " -- replaced with %s", nfile);
1744         fprintf(stderr, "\n");
1745         fflush(stderr);
1746 }
1747
1748 /* print test results */
1749 static void
1750 print_test(const char *file, int ok)
1751 {
1752
1753         if (exit_value == 0 && ok == 0)
1754                 exit_value = 1;
1755         fprintf(stderr, "%s:%s  %s\n", file,
1756             strlen(file) < 7 ? "\t\t" : "\t", ok ? "OK" : "NOT OK");
1757         fflush(stderr);
1758 }
1759 #endif
1760
1761 /* print a file's info ala --list */
1762 /* eg:
1763   compressed uncompressed  ratio uncompressed_name
1764       354841      1679360  78.8% /usr/pkgsrc/distfiles/libglade-2.0.1.tar
1765 */
1766 static void
1767 print_list(int fd, off_t out, const char *outfile, time_t ts)
1768 {
1769         static int first = 1;
1770 #ifndef SMALL
1771         static off_t in_tot, out_tot;
1772         uint32_t crc = 0;
1773 #endif
1774         off_t in = 0;
1775         int rv;
1776
1777         if (first) {
1778 #ifndef SMALL
1779                 if (vflag)
1780                         printf("method  crc     date  time  ");
1781 #endif
1782                 if (qflag == 0)
1783                         printf("  compressed uncompressed  "
1784                                "ratio uncompressed_name\n");
1785         }
1786         first = 0;
1787
1788         /* print totals? */
1789 #ifndef SMALL
1790         if (fd == -1) {
1791                 in = in_tot;
1792                 out = out_tot;
1793         } else
1794 #endif
1795         {
1796                 /* read the last 4 bytes - this is the uncompressed size */
1797                 rv = lseek(fd, (off_t)(-8), SEEK_END);
1798                 if (rv != -1) {
1799                         unsigned char buf[8];
1800                         uint32_t usize;
1801
1802                         if (read(fd, (char *)buf, sizeof(buf)) != sizeof(buf))
1803                                 maybe_warn("read of uncompressed size");
1804                         usize = buf[4] | buf[5] << 8 | buf[6] << 16 | buf[7] << 24;
1805                         in = (off_t)usize;
1806 #ifndef SMALL
1807                         crc = buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24;
1808 #endif
1809                 }
1810         }
1811
1812 #ifndef SMALL
1813         if (vflag && fd == -1)
1814                 printf("                            ");
1815         else if (vflag) {
1816                 char *date = ctime(&ts);
1817
1818                 /* skip the day, 1/100th second, and year */
1819                 date += 4;
1820                 date[12] = 0;
1821                 printf("%5s %08x %11s ", "defla"/*XXX*/, crc, date);
1822         }
1823         in_tot += in;
1824         out_tot += out;
1825 #endif
1826         printf("%12llu %12llu ", (unsigned long long)out, (unsigned long long)in);
1827         print_ratio(in, out, stdout);
1828         printf(" %s\n", outfile);
1829 }
1830
1831 /* display the usage of NetBSD gzip */
1832 static void
1833 usage(void)
1834 {
1835
1836         fprintf(stderr, "%s\n", gzip_version);
1837         fprintf(stderr,
1838     "usage: %s [-" OPT_LIST "] [<file> [<file> ...]]\n"
1839 #ifndef SMALL
1840     " -c --stdout          write to stdout, keep original files\n"
1841     "    --to-stdout\n"
1842     " -d --decompress      uncompress files\n"
1843     "    --uncompress\n"
1844     " -f --force           force overwriting & compress links\n"
1845     " -h --help            display this help\n"
1846     " -n --no-name         don't save original file name or time stamp\n"
1847     " -N --name            save or restore original file name and time stamp\n"
1848     " -q --quiet           output no warnings\n"
1849     " -r --recursive       recursively compress files in directories\n"
1850     " -S .suf              use suffix .suf instead of .gz\n"
1851     "    --suffix .suf\n"
1852     " -t --test            test compressed file\n"
1853     " -v --verbose         print extra statistics\n"
1854     " -V --version         display program version\n"
1855     " -1 --fast            fastest (worst) compression\n"
1856     " -2 .. -8             set compression level\n"
1857     " -9 --best            best (slowest) compression\n",
1858 #else
1859     ,
1860 #endif
1861             getprogname());
1862         exit(0);
1863 }
1864
1865 /* display the version of NetBSD gzip */
1866 static void
1867 display_version(void)
1868 {
1869
1870         fprintf(stderr, "%s\n", gzip_version);
1871         exit(0);
1872 }
1873
1874 #ifndef NO_BZIP2_SUPPORT
1875 #include "unbzip2.c"
1876 #endif
1877 #ifndef NO_COMPRESS_SUPPORT
1878 #include "zuncompress.c"
1879 #endif